开云体育

74[L]S387 did ring an ancient bell.

I could find a reference here on page 5-13:

"U65 will normally be a *74S287* or *74S387*. These are fusible link programmable read only memories. They have eight inputs, two disables, and four outputs. Each output can be programmed (permanently) to produce any function of eight input variables, controlled on an on-or-off basis by two more variables, the disables."

However, DEC sees the *74LS387* as tri-state buffers, on page 147:

and Mostek too, non-tristate, page 4-17:


Curiouser and curiouser...
I'd have to dig deep in the old boxes for the TTL databooks.

Arie